alias to struct method

[Marc via Digitalmars-d-learn]

How can I create a alias to a struct method?

struct S {
 string doSomething(int n) { return ""; }
}

I'd like to do something like this (imaginary code):

alias doSomething = S.doSomething;

then call it by doSomething(3)

I got the following error from this code:

Error: need 'this' for 'gen' of type 'string(int n)'

So I tried create a instance:

alias doSomething = S().doSomething;

Changes the error to:

app.d(96): Error: function declaration without return type. (Note that > constructors are always named this)

app.d(96): Error: semicolon expected to close alias declaration